. >> investigators are still looking into the background of the older brother, tamerlan, and his possible links to militant islamists. whether the brothers received operational plans from a militant group in the chechnya area. we'll have more on that coming up at 7:35. now for more on the boston bombings, you can go to our website where we have a special section on details. go to ktvu.com for our continuing coverage online. plus, later in this newscast. infrared images of dzhokhar is coming up at 7:31. how these black and white pictures kept police safe. >>> as the bombing suspect lies in a hospital bed. a legal debate is brewing over the charges they should file against him. katie is live to explain what those charges may be. >> as you mentioned, justice department officials told cnn dzhokhar tsarnaev is facing federal terrorism charges and state murder charges. preliminary hearing could happen in the next 30 days. a lot hinges on when the suspect is well enough to speak. investigators are eager for him to talk so they can find out who planned the attack. tsarnaev will likely be appointe